Comment 7 for bug 1933128

From the other LP's juju-crash-dump - first error: /var/log/juju/unit-etcd-2.log

tracer: hooks phase, 1 handlers queued
tracer: ++ queue handler hooks/relations/etcd/provides.py:22:joined_or_changed
2021-10-03 18:35:22 INFO unit.etcd/2.juju-log server.go:325 db:113: Invoking reactive handler: hooks/relations/etcd/provides.py:22:joined_or_changed
2021-10-03 18:35:22 DEBUG unit.etcd/2.juju-log server.go:325 db:113: tracer: set flag db.connected
2021-10-03 18:35:22 DEBUG unit.etcd/2.juju-log server.go:325 db:113: tracer>
tracer: main dispatch loop, 6 handlers queued
tracer: ++ queue handler hooks/relations/tls-certificates/requires.py:79:joined:certificates
tracer: ++ queue handler reactive/etcd.py:122:set_app_version
tracer: ++ queue handler reactive/etcd.py:136:prepare_tls_certificates
tracer: ++ queue handler reactive/etcd.py:247:set_db_ingress_address
tracer: ++ queue handler reactive/tls_client.py:18:store_ca
tracer: ++ queue handler reactive/tls_client.py:71:store_client
2021-10-03 18:35:22 INFO unit.etcd/2.juju-log server.go:325 db:113: Invoking reactive handler: reactive/etcd.py:122:set_app_version
2021-10-03 18:35:22 WARNING unit.etcd/2.db-relation-joined logger.go:60 cannot open cgroup hierarchy /sys/fs/cgroup/freezer: No such file or directory
2021-10-03 18:35:22 ERROR unit.etcd/2.juju-log server.go:325 db:113: Failed to get etcd version:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-etcd-2/charm/reactive/etcd.py", line 893, in etcd_version
    raw_output = check_output(
  File "/usr/lib/python3.8/subprocess.py", line 415, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.8/subprocess.py", line 516, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/snap/bin/etcd.etcdctl', 'version']' returned non-zero exit status 1.